[GRASS-dev] import/export projection error

[Martin Wegmann]

the shift only happens for r.out.gdal export of AAIGrid not for geotiff or 
hfa. 
So far it seems that the 3 ( and upward) decimal place of the pixel size 
(AAIGrid exports only) differs from the original (and GRASS imported) file 
what causes the error on a very large scale. 

regards, Martin

On Friday 05 May 2006 18:43, Martin Wegmann wrote:
> Hello,
>
> I just encountered a very peculiar error.
>
> import of latlong/WGS84 geotif
> import of latlong/WGS84 shp
>
> border fits well
>
> export of latlong/WGS84 asc/img etc. via r.out.gdal
>
> load GRASS export asc into QGIS plus shp layer:
>
> upper left: border fits good
> middle left: border is shifted slightly
> lower right: border does not fit at all
>
> load original geotif into QGIS, overlay with shp layer: border fits
>
> it is a continental raster/shp - perhaps only this extent makes the problem
> visible.
>
> I attached the original raster + shp and the GRASS exported raster + shp in
> QGIS
>
> if somebody wants to have the original files for testing, please feel free
> to contact me.
>
> cheers, Martin

-- 
Martin Wegmann

DLR - German Aerospace Center
German Remote Sensing Data Center
@
Dept.of Geography
Remote Sensing and Biodiversity Unit
&&
Dept. of Animal Ecology and Tropical Biology
University of Wuerzburg
Am Hubland
97074 Würzburg

phone: +49-(0)931 - 888 4797
mobile: +49-(0)175 2091725
fax:   +49-(0)931 - 888 4961
http://www.biota-africa.org
http://www.biogis.de